Sphygmomanometer.



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PHILADELPHIA, l-ENNSYLVAEKIA, ASSIGNOR T0 PRECISIGN THEE- MQMETER &INSTRUT/LENT COMPANY, 035 PHILADELPHIA, PENNSYLVANIA, A COR- PORATION015 PENNSYLVANIA.

SIPHZGMOMANQIVIETEE.

Application filed July 27, 191.5.

To all whom it may concern:

Be it known that l, CARL R. WASER, a citizen of the United States,residing in the city of Philadelphia, county of Philadelphia, and Stateof Pennsylvania, have invented certain Improvements inSphygmomanometers, of which the following is a .specification.

culty has been experlenced in compensating for the wear, compression andshrinkage which occur in joint packings with time and use.

My improvements are designed to provide means for pressing together thejointed parts of a collapsible or take-down instrument so as to securetight joints, and to this end they are characterized, in the preferredform of the construction, by the use of hinged tube sections that aremovable longitudinally when erected and pressed against their seatsby'springs.

The character of my improvements will more fully appear by reference tothe following description and the accompanying drawings in illustrationthereof.

In the drawings, Figure 1 is a front eleva tion of an erectedsphygmoman'ometer embodying my improvements; Fig. 2 is an enlargedbroken sectional view taken on the line 22 of Fig. 1; Fig. 3 is anenlarged broken sectional view taken on the line 3-3 of Fig. 1; Fig. 4is an enlarged broken vertical section through the tube joint shown inFig. 1; Fig. 5 is a broken front elevation of a modified construction;Fig. 6 is an enlarged broken vertical sectional view of the modifiedconstruction taken on the line 6-6 of Fig. 5; and Fig. 7 is a sectionalview taken on the line 7-7 of Fig. 6.

The mechanism illustrated comprises a case 1 provided with a hinged lid2 which supports the base 3, the cistern 4: having its lower end set inthe base, the fixture 5 con- Specification of Letters Patent.

Patented J 36 19 1?.

Serial No. 42,123.

nected with the top of the cistern, the tube lower end set in the base 3and its upper end trated clip or sleeve 7, and the tube section 8 havingon the lower end thereof the fenestrated clip or sleeve 9 which ispivotally connected by its hinge knuckles 9 with the hinge knuckles 7 ofthe clip 7. Spring dogs or catches 10 are fixed to the lid and providedwith cam jaws 10 which are adapted for engaging the angles of theknuckles 9' to hold the erected tube section 8 in position, the jointbetween the tube sections being sealed by packing means comprising awasher 11 held in a ring 11. A scale, comprising a section 12 fixed tothe lid and a folding section 13 hinged to the section 12 by pivotallyconnected knuckles 12 and 13 on the respective sections, provides meansfor reading the height of liquid in the tube. In accordance with mypresent invention, in the form illustrated in Figs. 1, 2, 3, and 4, thebearing 14 of the fixture 5 is provided with a slot 14: through whichpasses a screw or stud 15 into the lid 2, and the bearing 1; of the base3 is provided with the slot 16 through which a screw or stud 17 passesinto the lid. The top of the tube section 6 has fixed thereon afenestrated sleeve 18 which extends through and is adapted to slidewithin the sleeve orclip 7, fixed to the lid, whereby the parts 3, 4, 5and 6 are permitted a limited longitudinal movement of reciprocation,the inner sleeve having a flange 18 on its top to limit the downwardmovement thereof. A leaf spring 19 is fixed to the lid 2 adjacent to thebase 3, the base resting 'upon and being supported by the spring.

lln operation, when the lid 2 is elevated and the tube section 8 iserected, its knuckles 9 engage the cam surfaces of the jaws 10' andspread the springs 10, which spring back and cause the jaws to engagethe tops of the knuckles when the section 8 has been brought intoalinement with the section 6. As the upper section 8 moves to its alinedposition, the lower end thereof presses against the washer 11 which isthus pressed against the upper end of the section 6 and the section 6 ispressed downward. As the action of the spring 19 on the base 3 resiststhe movement of the tube 6 with the sleeve 18 thereon, the parts 6 and 8are pressed firmly against the washer 11, the spring acttion 6, theupper acts through the washer 11 ing to effect this relation under allconditions of use. p

In the modified form illustrated in Figs. 5, 6,. and 7, the tube section8 has a fenestrated sleeve 20 fixed on the lower end thereof and movablein the fenestrated clip or sleeve 9, the clip 9 having'lugs 9" thereonand the clip 20 having lugs 20 thereon which are connected by coiledsprings 21. i

When the section 8 is turned from the closed to the erected position,the springs 10 are pressed outwardly by engagement of the knuckles 9with the jaws or cams 10 until the latter are able to engage above theangles of the knuckles, when the jaws lock the sleeve in position. Inturning the upper section 8 into alinement with the lower secend of thelower section upon the upper section which, with the sleeve 20 thereon,is moved upwardly through the sleeve 9 against the action of the springs21, whereby pressure is constantly maintained upon the packing, Thesleeve 20 is provided with a shoulder 20 which limits the movement ofthe part 8 through the part 9 due to the action of the springs21.

Having described my invention, I claim:

1. In an instrument of the character described, a plurality of tubesections, hinged devices with which said sections are respectivelyconnected, and means for moving one of said tube sections relatively tothe device with which it is connected so as to maintain a tight jointbetween said tube sections.

2. In an instrument of the character described, a plurality of tubesections, hinged clips connecting said sections,.a spring for pressingone of the alined sections longitudinally toward the other, and meansfor holding the other of said sections against the action of saidspring.

3. In an instrument of the character described, liquid supply means anda tube section connected in communicating relation, a supporting deviceto which said means and section are connected in movable relation, asecond tube section hinged relative to said section first named, andmeans comprising a spring acting against sa1d means and section firstnamed for maintaining a tight joint between said sections.

' In an instrument of the character described, liquid supply means and atube section connected therewith, a supporting device to which saidmeans and section are connected in movable relation, means comprising asecond tube section hinged relatively to said supporting device so as tobe movable into alinement with said section first named and exertpressure against the same, and resilient means for supporting saidsupply means and tube section first named.

5. In an instrument of the character described, supporting meanscomprising a clip, a longitudinally movable tube section guided by saidclip, a second tube section, and means comprising a spring formaintaining a tight joint between said sections.

6. In an instrument of the character described, supporting meanscomprising a fenestrated sleeve, a tube section having a fenestratedsleeve on an end thereof and movable longitudinally in said sleeve firstnamed, a fenestrated sleeve hinged to said sleeve first named, a tubesection set in said sleeve third named so as to be movable intoregistration with and exert pressure on the registering end of saidsection first named, and a spring for supporting said section firstnamed.

7 In an instrument of the character described, a pair of hinged clips, atube section having an end held so as to be movable longitudinally inone of said clips, a tube section having an end held in the other ofsaid clips, a washer, means for holding said Washer on an end of one ofsaid sections, and means for pressing said longitudinally movablesection toward the complementary section in registration therewith.

In testimony whereof I have hereunto set my name this 26th day of July,1915.

CARL R. WASER.

